Bacteria are observed in _____ in the early stage of infection.

Correct option is A

Correct Answer: (a) Peripheral blood
Explanation:
→ In early bacterial infections, pathogens first appear in the peripheral blood before colonizing organs.
→ Bloodstream facilitates rapid systemic spread.
Information Booster:
→ Blood smears are useful for early diagnosis of septicemic diseases.
Additional Information:
(b), (c): Organs affected later during systemic infection.
(d) Endocytic vesicles: Intracellular stage occurs after systemic spread.